AEs in living plants are related to the drought stress which induces the cavitation. The irrigation
management is important factor to cultivate the tomato plants under suitable drought stress. In this study, the
response to irrigation of miniature-tomato plants was evaluated using AE method. We proposed that the change of
AE occurrence rate before and after the irrigation RD represented the stress response to the change of the drought
stress. The AE measurement of hydroponic miniature-tomato with high-frequency irrigation revealed that the RD
was influenced by the irrigation schedule. Furthermore, the average value of RD was deeply related to the yield and
the sugar content of the fruits.

Recently, dye-sensitized solar cells (DSCs) have been developed as one of the lowest-cost solar cells. Especially, flexible substrates yield flexibility to DSCs, which becomes attractive advantages in industrial application. However, it is well known that they have a disadvantage of short lifetime under the condition with mechanical loading. Therefore, the technique for damage monitoring is a key technology for the durability of DSCs. Tensile test of transparent conductive oxide (TCO) deposited on polyerhylene naphthalate (PEN) film (TCO + PEN film, Peccel Technologies, PFCF), which is used for dye-sensitized solar cells (DSCs), was carried out in this study. PEN film (TCO was removed by dilute hydrochloric acid) was also prepared to discriminate AE signals from PEN and TCO. The result of tensile test showed that many AE signals were detected in TCO + PEN film, while few AE signals in PEN film. On the other hand, electric resistance of TCO also measured during tensile test. AE event rate began to increase at the strain of 0.63%, and electric resistance increased rapidly at the strain of 0.68%.These results suggested that critical damage in TCO was detected by AE monitoring more sensitively than electric resistance. In-situ observation of specimen during tensile test demonstrated that cracks transverse to the loading direction in the TCO were initiated at the strain of ~0.67%, and then saturated at the strain of 9.63%. It was emphasized that AE signals correspond to the cracks in TCO. Damage in TCO under mechanical strain was successfully monitored by AE technique. Consequently, it was suggested that AE technique will be a powerful technique for degradation of DSCs.